The unit of potential difference is the volt.
Starting with the definition of potential difference, we can obtain an equivalent unit as J/C\text{J/C}J/C (joule per coulomb).
Using potential difference=work done (or energy transferred)charge\displaystyle \text{potential difference} = \frac{\text{work done (or energy transferred)}}{\text{charge}}potential difference=chargework done (or energy transferred)
unit of potential difference=unit of energyunit of charge=J/C\displaystyle \text{unit of potential difference} = \frac{\text{unit of energy}}{\text{unit of charge}} = \text{J/C}unit of potential difference=unit of chargeunit of energy=J/C
The unit of electrical resistance is the ohm (Ω\OmegaΩ).
Explain how, starting with the definition of electrical resistance, we may obtain an equivalent unit of resistance.
59 exam-style questions on Edexcel GCSE Physics 10.2 Resistance. Each one has a worked solution and a mark scheme showing where the marks go.